Hallow Dear,
Let me answer your query in stages:
1. If your girl friend had started her menses on the day next to the intercourse, you do not have to worry about
pregnancy due to this sexual act. She is not pregnant.
2. There was no necessity of consuming
Postinor 2 since she had menses after the sexual intercourse. However, she has taken the pills within 72 hours of the intercourse. So she has taken them within the prescribed time.
3. After Postinor, the menses do get delayed for about a week or so. So you may wait expectantly for the periods to appear. If they do not appear even after a week, she may take Tab.
Deviry for 5 days and 4-7 days after that, she will get withdrawal bleeding.
4. To avoid such stressful situations in future, please follow some reliable
contraceptive method like contraceptive pills, condom or
intrauterine device.
I hope this helps you.
Dr. Nishikant Shrotri